I think I'd generally remind everyone that being a bit bullish on Switch sales is a good thing - expect more, expect good things out of this console. We're now expecting its first year to outsell the Wii U's LTD figure, and we could see a massive 25 million to 30 million units produced in 2018. That's a strong indicator that a lot of people, inside Nintendo and out, expect this to be another commercial behemoth; the magic 100 million mark isn't happening until like 2021 at the earliest, but it's not out of the question during the console's lifetime.
When Nintendo comes out swinging with a brand new gimmick, things get wild and unpredictable!
If they were willing to just port Mario Kart 8, perhaps the flagship revenue generating super IP in their wheelhouse, I don't think it's out of the question to port over the game that already has 54 characters and like 40 stages ready to go. Especially Since SSB5 would probably need like 2-3 years in the oven from announcement
I disagree about that development time - I don't think they'd wait that long, especially 3 years, to release a product that will be one of their primary revenue drivers and that is already highly anticipated for the console. There's no way they'd so thoroughly dissatisfy their consumers with such a monumental wait. I really wouldn't be surprised if SSB5 is actually already in early development and looking at a late 2018 or 2019 release - that's not really even 2 years from now.
You do have a point, however, with the level of preparation that's gone into SSB4 and how that might incentivize a port, which would thereby change the timeline for SSB5. I don't think it's the same situation as MK8 and what inspired them to release that soon after the console, but I concede that the situation is similar and a lot of time and money has been invested into SSB4. The most likely scenario I see is a sort of SSB4 Deluxe coming next year, with all prior content included and some new content or DLC on the way for the Switch edition. I don't expect the next entry to be out any later than 2020 or so, though. They've got a smash hit console on their hands, and they'll want to drive sales with flagship releases and franchises for years - so they've probably got quite a bit already planned.
Nintendo had no problem selling three different Game Boys, three different Nintendos, and two different... however you prefer to pluralize "DS". Except for the dumbest consumers, I don't think the name was anywhere near the problem people wanted to make it out to be.
People trotted that excuse out for the 3DS when it was doing lackluster and, mysteriously, this stopped being an issue the moment mario kart, mario 3d land and a price drop hit
While I *know* there's people that thought wii u was just a wii-but-more (also an issue I don't think was a thing considering the wii mini had no such problems) I doubt such a problem was widespread
It's pretty widely agreed upon, by analysts and casuals alike, that the name was a problematic component of the overall image and marketing, which cause people to think that it was simply a peripheral device or altogether not different enough to warrant a purchase.
The Switch having stellar marketing and image so far is definitely one of the primary differences and what has attracted better games and devs. I'm fully confident that it will at the very least do as well as the PS4 and I won't be surprised if the Switch line of devices (since more iterations are almost inevitable) do as well as the Wii in the end.
There's really not that much else on which you can blame the straight-up abysmal figures for the Wii U. You could say that it was a lack of games, but that was due directly to its complete lack of sales longevity. You could say that the dual screen design was awkward and made much less sense than a handheld dual-screen system, I suppose - that's part of what made people perceive it as a peripheral device, along with the name and marketing. You could even argue that its highly unfavorable specs compared to the XB1 and PS4 lines was a factor, but when has Nintendo (recently) been known for raw power and state of the art graphics?
The only other thing truly differentiating the consoles, besides general marketing, is the central gimmick. The Wii U didn't have one that was, well, any good. Two screens had been done in handheld games but made things awkward and clunky on console. Motion controls were by then old news. The Switch's integral, well, switch is the only thing I see besides the marketing that explains the wildly more positive commercial response.